/*
 * Copyright 2021 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * @param {EleventyCollectionItem} a An eleventy post object.
 * @param {EleventyCollectionItem} b An eleventy post object.
 * @return {number} The difference in their date's.
 */
function sortByUpdated(a, b) {
  const aTime = a.data.updated ? a.data.updated.getTime() : a.date.getTime();
  const bTime = b.data.updated ? b.data.updated.getTime() : b.date.getTime();

  return bTime - aTime;
}

module.exports = {sortByUpdated};
